[Fixes #4102] DefaultHtmlGenerator should attempt to properly format values for <input type="date"> and <input type="time">

src/Microsoft.AspNetCore.Mvc.ViewFeatures/Rendering/Html5DateRenderingMode.cs

@@ -10,14 +10,14 @@ namespace Microsoft.AspNetCore.Mvc.Rendering
     public enum Html5DateRenderingMode
     {
         /// <summary>
-        /// Render date and time values according to the current culture's ToString behavior.
+        /// Render date and time values as Rfc3339 compliant strings to support HTML5 date and time types of input
+        /// elements.
         /// </summary>
-        CurrentCulture = 0,
+        Rfc3339 = 0,
 
         /// <summary>
-        /// Render date and time values as Rfc3339 compliant strings to support HTML5 date and time types of input
-        /// elements.
+        /// Render date and time values according to the current culture's ToString behavior.
         /// </summary>
-        Rfc3339,
+        CurrentCulture,
     }
 }

test/Microsoft.AspNetCore.Mvc.FunctionalTests/compiler/resources/HtmlGenerationWebSite.HtmlGeneration_Home.Order.Encoded.html

@@ -11,7 +11,7 @@
         </div>
         <div>
             <label class="order" for="HtmlEncode[[ShippingDateTime]]">HtmlEncode[[ShippingDateTime]]</label>
-            <input type="HtmlEncode[[datetime-local]]" data-val="HtmlEncode[[true]]" data-val-required="HtmlEncode[[The ShippingDateTime field is required.]]" id="HtmlEncode[[ShippingDateTime]]" name="HtmlEncode[[ShippingDateTime]]" value="HtmlEncode[[01/01/0001 00:00:00]]" />
+            <input type="HtmlEncode[[datetime-local]]" data-val="HtmlEncode[[true]]" data-val-required="HtmlEncode[[The ShippingDateTime field is required.]]" id="HtmlEncode[[ShippingDateTime]]" name="HtmlEncode[[ShippingDateTime]]" value="HtmlEncode[[0001-01-01T00:00:00.000]]" />
         </div>
         <div>
             <label class="order" for="HtmlEncode[[Products]]">HtmlEncode[[Products]]</label>

test/Microsoft.AspNetCore.Mvc.FunctionalTests/compiler/resources/HtmlGenerationWebSite.HtmlGeneration_Home.Order.html

@@ -11,7 +11,7 @@
         </div>
         <div>
             <label class="order" for="ShippingDateTime">ShippingDateTime</label>
-            <input type="datetime-local" data-val="true" data-val-required="The ShippingDateTime field is required." id="ShippingDateTime" name="ShippingDateTime" value="01/01/0001 00:00:00" />
+            <input type="datetime-local" data-val="true" data-val-required="The ShippingDateTime field is required." id="ShippingDateTime" name="ShippingDateTime" value="0001-01-01T00:00:00.000" />
         </div>
         <div>
             <label class="order" for="Products">Products</label>

test/Microsoft.AspNetCore.Mvc.ViewFeatures.Test/Internal/DefaultEditorTemplatesTest.cs

@@ -606,10 +606,10 @@ public void Editor_FindsViewDataMember()
 
         // DateTime-local is not special-cased unless using Html5DateRenderingMode.Rfc3339.
         [Theory]
-        [InlineData("date", "{0:d}", "02/01/2000")]
-        [InlineData("datetime", null, "02/01/2000 03:04:05 +00:00")]
-        [InlineData("datetime-local", null, "02/01/2000 03:04:05 +00:00")]
-        [InlineData("time", "{0:t}", "03:04")]
+        [InlineData("date", "{0:d}", "2000-01-02")]
+        [InlineData("datetime", null, "2000-01-02T03:04:05.006+00:00")]
+        [InlineData("datetime-local", null, "2000-01-02T03:04:05.006")]
+        [InlineData("time", "{0:t}", "03:04:05.006")]
         [ReplaceCulture]
         public void Editor_FindsCorrectDateOrTimeTemplate(string dataTypeName, string editFormatString, string expected)
         {